Here are some common mistakes that people make when investing:1. Not Having a Plan: Investing without a clear plan can lead to impulsive decisions and poor investment choices. It's important to set long-term goals and develop a strategy based on your risk tolerance and investment objectives.2. Focusing on Short-term Gains: Investing is a long-term game, and focusing on short-term gains can lead to poor investment decisions. It's important to focus on the long-term potential of an investment, rather than its short-term performance.3. Not Diversifying Your Portfolio: Putting all your money into one investment is a risky strategy. Diversifying your portfolio by investing in different asset classes can help reduce risk and increase potential returns.4. Ignoring Fees and Expenses: Investment fees and expenses can eat into your returns over time. It's important to understand the fees associated with each investment and choose low-cost options whenever possible.5. Reacting to Market Volatility: Market volatility is a normal part of investing, but reacting to short-term fluctuations can lead to poor investment decisions. It's important to stay disciplined and stick to your long-term investment plan, even during times of market volatility.